Releted MCQ Question on
Electrostatics and Magnetism >> Electromagnetic Induction
Releted Question 1
A thin circular ring of area $$A$$ is held perpendicular to a uniform magnetic field of induction $$B.$$ $$A$$ small cut is made in the ring and a galvanometer is connected across the ends such that the total resistance of the circuit is $$R.$$ When the ring is suddenly squeezed to zero area, the charge flowing through the galvanometer is
A.
$$\frac{{BR}}{A}$$
B.
$$\frac{{AB}}{R}$$
C.
$$ABR$$
D.
$$\frac{{{B^2}A}}{{{R^2}}}$$
Releted Question 2
A thin semi-circular conducting ring of radius $$R$$ is falling with its plane vertical in horizontal magnetic induction $$\overrightarrow B .$$ At the position $$MNQ$$ the speed of the ring is $$v,$$ and the potential difference developed across the ring is
A thin semi-circular conducting ring of radius $$R$$ is falling with its plane vertical in horizontal magnetic induction $$\overrightarrow B .$$ At the position $$MNQ$$ the speed of the ring is $$v,$$ and the potential difference developed across the ring is
A.
zero
B.
$$\frac{{Bv\pi {R^2}}}{2}$$ and $$M$$ is at higher potential
C.
$$\pi RBv$$ and $$Q$$ is at higher potential
D.
$$2RBv$$ and $$Q$$ is at higher potential
Releted Question 3
Two identical circular loops of metal wire are lying on a table without touching each other. Loop-$$A$$ carries a current which increases with time. In response, the loop-$$B$$
A.
remains stationary
B.
is attracted by the loop-$$A$$
C.
is repelled by the loop-$$A$$
D.
rotates about its $$CM,$$ with $$CM$$ fixed
Releted Question 4
A coil of inductance $$8.4 mH$$ and resistance $$6\,\Omega $$ is connected to a $$12 V$$ battery. The current in the coil is $$1.0 A$$ at approximately the time
A.
$$500 s$$
B.
$$25 s$$
C.
$$35 ms$$
D.
$$1 ms$$